error_t
setup_thread_target (void)
{
error_t err;
static task_t task;
static thread_t thread;
if (MACH_PORT_VALID (thread))
{
thread_terminate (thread);
mach_port_deallocate (mach_task_self (), thread);
}
if (MACH_PORT_VALID (task))
{
task_terminate (task);
mach_port_deallocate (mach_task_self (), task);
}
err = task_create (mach_task_self (), 0, &task);
if (err)
return err;
err = thread_create (task, &thread);
if (err)
return err;
return setup (thread, MACH_MSG_TYPE_COPY_SEND);
}
void
_exit(int status)
{
for (;;)
task_terminate(task_self());
}
int task_exit(void)
{
FAR struct tcb_s *dtcb = (FAR struct tcb_s*)g_readytorun.head;
FAR struct tcb_s *rtcb;
int ret;
/* Remove the TCB of the current task from the ready-to-run list. A context
* switch will definitely be necessary -- that must be done by the
* architecture-specific logic.
*
* sched_removereadytorun will mark the task at the head of the ready-to-run
* with state == TSTATE_TASK_RUNNING
*/
(void)sched_removereadytorun(dtcb);
rtcb = (FAR struct tcb_s*)g_readytorun.head;
/* We are now in a bad state -- the head of the ready to run task list
* does not correspond to the thread that is running. Disabling pre-
* emption on this TCB and marking the new ready-to-run task as not
* running (see, for example, get_errno_ptr()).
*
* We disable pre-emption here by directly incrementing the lockcount
* (vs. calling sched_lock()).
*/
rtcb->lockcount++;
rtcb->task_state = TSTATE_TASK_READYTORUN;
/* Move the TCB to the specified blocked task list and delete it. Calling
* task_terminate with non-blocking true will suppress atexit() and on-exit()
* calls and will cause buffered I/O to fail to be flushed. The former
* is required _exit() behavior; the latter is optional _exit() behavior.
*/
sched_addblocked(dtcb, TSTATE_TASK_INACTIVE);
ret = task_terminate(dtcb->pid, true);
rtcb->task_state = TSTATE_TASK_RUNNING;
/* If there are any pending tasks, then add them to the ready-to-run
* task list now
*/
if (g_pendingtasks.head)
{
(void)sched_mergepending();
}
/* We can't use sched_unlock() to decrement the lock count because the
* sched_mergepending() call above might have changed the task at the
* head of the ready-to-run list. Furthermore, we should not need to
* perform the unlock action anyway because we know that the pending
* task list is empty. So all we really need to do is to decrement
* the lockcount on rctb.
*/
rtcb->lockcount--;
return ret;
}
int
mach_init_doit(bool forkchild)
{
/*
* Get the important ports into the cached values,
* as required by "mach_init.h".
*/
mach_task_self_ = task_self_trap();
/*
* Initialize the single mig reply port
*/
_pthread_set_self(0);
_mig_init(0);
#if WE_REALLY_NEED_THIS_GDB_HACK
/*
* Check to see if GDB wants us to stop
*/
{
task_user_data_data_t user_data;
mach_msg_type_number_t user_data_count = TASK_USER_DATA_COUNT;
user_data.user_data = 0;
(void)task_info(mach_task_self_, TASK_USER_DATA,
(task_info_t)&user_data, &user_data_count);
#define MACH_GDB_RUN_MAGIC_NUMBER 1
#ifdef MACH_GDB_RUN_MAGIC_NUMBER
/* This magic number is set in mach-aware gdb
* for RUN command to allow us to suspend user's
* executable (linked with this libmach!)
* with the code below.
* This hack should disappear when gdb improves.
*/
if ((int)user_data.user_data == MACH_GDB_RUN_MAGIC_NUMBER) {
kern_return_t ret;
user_data.user_data = 0;
ret = task_suspend(mach_task_self_);
if (ret != KERN_SUCCESS) {
while (1) {
(void)task_terminate(mach_task_self_);
}
}
}
#undef MACH_GDB_RUN_MAGIC_NUMBER
#endif /* MACH_GDB_RUN_MAGIC_NUMBER */
}
#endif /* WE_REALLY_NEED_THIS_GDB_HACK */
return 0;
}
error_t
setup_task_target (void)
{
error_t err;
static task_t task;
static mach_msg_type_name_t taskType = MACH_MSG_TYPE_COPY_SEND;
if (MACH_PORT_VALID (task))
{
task_terminate (task);
mach_port_deallocate (mach_task_self (), task);
}
err = task_create (mach_task_self (), 0, &task);
if (err)
return err;
return setup (task, taskType);
}
int task_delete(pid_t pid)
{
FAR struct tcb_s *rtcb;
/* Check if the task to delete is the calling task */
rtcb = (FAR struct tcb_s*)g_readytorun.head;
if (pid == 0 || pid == rtcb->pid)
{
/* If it is, then what we really wanted to do was exit. Note that we
* don't bother to unlock the TCB since it will be going away.
*/
exit(EXIT_SUCCESS);
}
/* Then let task_terminate do the heavy lifting */
return task_terminate(pid, false);
}
void
exception_no_server(void)
{
ipc_thread_t self = current_thread();
/*
* If this thread is being terminated, cooperate.
*/
while (thread_should_halt(self))
thread_halt_self(thread_exception_return);
#if 0
if (thread_suspend (self) == KERN_SUCCESS)
thread_exception_return ();
#endif
#if MACH_KDB
if (debug_user_with_kdb) {
/*
* Debug the exception with kdb.
* If kdb handles the exception,
* then thread_kdb_return won't return.
*/
db_printf("No exception server, calling kdb...\n");
thread_kdb_return();
}
#endif /* MACH_KDB */
/*
* All else failed; terminate task.
*/
(void) task_terminate(self->task);
thread_halt_self(thread_exception_return);
panic("terminating the task didn't kill us");
/*NOTREACHED*/
}
/*
* Panic system call.
*
* If kernel is built with debug option, sys_panic() displays
* a panic message and stops the enture system. Otherwise, it
* terminates the task which called sys_panic().
*/
int
sys_panic(const char *str)
{
#ifdef DEBUG
task_t self = cur_task();
irq_lock();
printf("\nUser mode panic: task:%s thread:%x\n",
self->name != NULL ? self->name : "no name", cur_thread);
sys_log(str);
printf("\n");
sched_lock();
irq_unlock();
for (;;);
#else
task_terminate(cur_task());
#endif
/* NOTREACHED */
return 0;
}
static void parse_typing(const char *buf, int len, void *refcon)
{
int i;
task_spec *spec = (task_spec*)refcon;
for(i=0; i<len; i++) {
switch(buf[i]) {
case 3: // ^C
case 24: // ^X
case 27: // ESC
case 'q':
case 'Q':
log_info("TYPING: Cancel!");
task_terminate(spec->master);
break;
default:
fprintf(stderr, "KEY: len=%d <<%.*s>>\r\n", len, len, buf);
;
}
}
log_dbg("TYPING (%d chars): %.*s", len, len, buf);
}
int task_restart(pid_t pid)
{
FAR struct tcb_s *rtcb;
FAR struct task_tcb_s *tcb;
FAR dq_queue_t *tasklist;
irqstate_t flags;
int errcode;
#ifdef CONFIG_SMP
int cpu;
#endif
int ret;
/* Check if the task to restart is the calling task */
rtcb = this_task();
if ((pid == 0) || (pid == rtcb->pid))
{
/* Not implemented */
errcode = ENOSYS;
goto errout;
}
/* We are restarting some other task than ourselves. Make sure that the
* task does not change its state while we are executing. In the single
* CPU state this could be done by disabling pre-emption. But we will
* a little stronger medicine on the SMP case: The task make be running
* on another CPU.
*/
flags = enter_critical_section();
/* Find for the TCB associated with matching pid */
tcb = (FAR struct task_tcb_s *)sched_gettcb(pid);
#ifndef CONFIG_DISABLE_PTHREAD
if (!tcb || (tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD)
#else
if (!tcb)
#endif
{
/* There is no TCB with this pid or, if there is, it is not a task. */
errcode = ESRCH;
goto errout_with_lock;
}
#ifdef CONFIG_SMP
/* If the task is running on another CPU, then pause that CPU. We can
* then manipulate the TCB of the restarted task and when we resume the
* that CPU, the restart take effect.
*/
cpu = sched_cpu_pause(&tcb->cmn);
#endif /* CONFIG_SMP */
/* Try to recover from any bad states */
task_recover((FAR struct tcb_s *)tcb);
/* Kill any children of this thread */
#ifdef HAVE_GROUP_MEMBERS
(void)group_killchildren(tcb);
#endif
/* Remove the TCB from whatever list it is in. After this point, the TCB
* should no longer be accessible to the system
*/
#ifdef CONFIG_SMP
tasklist = TLIST_HEAD(tcb->cmn.task_state, tcb->cmn.cpu);
#else
tasklist = TLIST_HEAD(tcb->cmn.task_state);
#endif
dq_rem((FAR dq_entry_t *)tcb, tasklist);
tcb->cmn.task_state = TSTATE_TASK_INVALID;
/* Deallocate anything left in the TCB's queues */
sig_cleanup((FAR struct tcb_s *)tcb); /* Deallocate Signal lists */
/* Reset the current task priority */
tcb->cmn.sched_priority = tcb->cmn.init_priority;
/* The task should restart with pre-emption disabled and not in a critical
* secton.
*/
tcb->cmn.lockcount = 0;
#ifdef CONFIG_SMP
tcb->cmn.irqcount = 0;
#endif
/* Reset the base task priority and the number of pending reprioritizations */
#ifdef CONFIG_PRIORITY_INHERITANCE
tcb->cmn.base_priority = tcb->cmn.init_priority;
# if CONFIG_SEM_NNESTPRIO > 0
tcb->cmn.npend_reprio = 0;
# endif
#endif
/* Re-initialize the processor-specific portion of the TCB. This will
* reset the entry point and the start-up parameters
*/
up_initial_state((FAR struct tcb_s *)tcb);
/* Add the task to the inactive task list */
dq_addfirst((FAR dq_entry_t *)tcb, (FAR dq_queue_t *)&g_inactivetasks);
tcb->cmn.task_state = TSTATE_TASK_INACTIVE;
#ifdef CONFIG_SMP
/* Resume the paused CPU (if any) */
if (cpu >= 0)
{
ret = up_cpu_resume(cpu);
if (ret < 0)
{
errcode = -ret;
goto errout_with_lock;
}
}
#endif /* CONFIG_SMP */
leave_critical_section(flags);
/* Activate the task. */
ret = task_activate((FAR struct tcb_s *)tcb);
if (ret != OK)
{
(void)task_terminate(pid, true);
errcode = -ret;
goto errout_with_lock;
}
return OK;
errout_with_lock:
leave_critical_section(flags);
errout:
set_errno(errcode);
return ERROR;
}
/*
* Routine: exception
* Purpose:
* The current thread caught an exception.
* We make an up-call to the thread's exception server.
* Conditions:
* Nothing locked and no resources held.
* Called from an exception context, so
* thread_exception_return and thread_kdb_return
* are possible.
* Returns:
* Doesn't return.
*/
void
exception_triage(
exception_type_t exception,
mach_exception_data_t code,
mach_msg_type_number_t codeCnt)
{
thread_t thread;
task_t task;
host_priv_t host_priv;
struct exception_action *excp;
lck_mtx_t *mutex;
kern_return_t kr;
assert(exception != EXC_RPC_ALERT);
if (exception == KERN_SUCCESS)
panic("exception");
/*
* Try to raise the exception at the activation level.
*/
thread = current_thread();
mutex = &thread->mutex;
excp = &thread->exc_actions[exception];
kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex);
if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
goto out;
/*
* Maybe the task level will handle it.
*/
task = current_task();
mutex = &task->lock;
excp = &task->exc_actions[exception];
kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex);
if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
goto out;
/*
* How about at the host level?
*/
host_priv = host_priv_self();
mutex = &host_priv->lock;
excp = &host_priv->exc_actions[exception];
kr = exception_deliver(thread, exception, code, codeCnt, excp, mutex);
if (kr == KERN_SUCCESS || kr == MACH_RCV_PORT_DIED)
goto out;
/*
* Nobody handled it, terminate the task.
*/
#if MACH_KDB
if (debug_user_with_kdb) {
/*
* Debug the exception with kdb.
* If kdb handles the exception,
* then thread_kdb_return won't return.
*/
db_printf("No exception server, calling kdb...\n");
thread_kdb_return();
}
#endif /* MACH_KDB */
(void) task_terminate(task);
out:
if (exception != EXC_CRASH)
thread_exception_return();
return;
}
kern_return_t
norma_task_common(
task_t parent_task,
boolean_t inherit_memory,
boolean_t clone,
boolean_t kill_parent,
int child_node,
task_t *child_task)
{
ipc_port_t remote_task, remote_host;
task_t new_task;
kern_return_t kr;
int vector_start;
unsigned int entry_vector_count;
ipc_port_t bootstrap;
emulation_vector_t entry_vector;
ipc_port_t registered[TASK_PORT_REGISTER_MAX];
exception_mask_t exc_masks[EXC_TYPES_COUNT];
ipc_port_t exc_ports[EXC_TYPES_COUNT];
exception_behavior_t exc_behaviors[EXC_TYPES_COUNT];
thread_state_flavor_t exc_flavors[EXC_TYPES_COUNT];
unsigned count, exc_count;
#if DIPC
if (!dipc_node_is_valid (child_node)) {
return KERN_INVALID_ARGUMENT;
}
if (child_node == dipc_node_self()) {
if (clone) {
/*
* Cloning: easy if kill_parent;
* (currently) impossible otherwise.
*/
if (kill_parent) {
/*
* Just return the parent -- nothing says that
* the clone has to be a different task.
*/
*child_task = parent_task;
return KERN_SUCCESS;
} else {
/*
* XXX
* There is no local call we can use with the
* same memory semantics -- we'd have to
* modify task_create_local, and vm_map_fork.
* Not hard, just probably unnecessary except
* for orthogonality.
*/
return KERN_INVALID_ARGUMENT;
}
} else {
/*
* Not cloning: just use task_create_local,
* and task_terminate if appropriate.
*/
kr = task_create_local(parent_task, inherit_memory,
FALSE, child_task);
if (kr != KERN_SUCCESS) {
return kr;
}
if (kill_parent) {
kr = task_terminate(parent_task);
if (kr != KERN_SUCCESS) {
/* cleanup */
(void) task_terminate(*child_task);
return kr;
}
}
return KERN_SUCCESS;
}
}
kr = task_get_emulation_vector(parent_task, &vector_start,
&entry_vector, &entry_vector_count);
if (kr != KERN_SUCCESS) {
printf("task_get_emulation_vector failed: kr %d %x\n", kr, kr);
return kr;
}
kr = task_get_inherited_ports(parent_task, &bootstrap, registered,
&count, exc_masks, &exc_count,
exc_ports, exc_behaviors, exc_flavors);
if (kr != KERN_SUCCESS) {
printf("task_get_inherited_ports failed: kr %d %x\n", kr, kr);
return kr;
}
remote_host = dipc_host_priv_port(child_node);
if (remote_host == IP_NULL) {
panic("norma_task_create: no priv port for node %d\n",
child_node);
return KERN_INVALID_ARGUMENT;
}
kr = r_norma_task_allocate(remote_host, vector_start, entry_vector,
entry_vector_count, bootstrap,
registered, count, exc_masks, exc_count,
exc_ports, exc_behaviors, exc_flavors,
&remote_task);
if (kr != KERN_SUCCESS) {
return kr;
}
if (inherit_memory) {
task_copy_vm(remote_host, parent_task->map, clone,
kill_parent, remote_task);
}
if (kill_parent) {
(void) task_terminate(parent_task);
}
/*
* Create a placeholder task for the benefit of convert_task_to_port.
* Set new_task->map to VM_MAP_NULL so that task_deallocate will
* know that this is only a placeholder task.
*/
new_task = (task_t) zalloc(task_zone);
if (new_task == TASK_NULL) {
panic("task_create: no memory for task structure");
}
#if MCMSG
new_task->mcmsg_task = 0;
#endif /* MCMSG */
/* only one ref, for our caller */
new_task->ref_count = 1;
new_task->map = VM_MAP_NULL;
new_task->itk_self = remote_task;
mutex_init(&new_task->lock, ETAP_NORMA_TASK);
itk_lock_init(new_task);
*child_task = new_task;
return(KERN_SUCCESS);
#else /* DIPC */
printf("norma_task_common: no underlying transport!\n");
return KERN_INVALID_ARGUMENT;
#endif /* DIPC */
}
void
boot_script_free_task (task_t task, int aborting)
{
if (aborting)
task_terminate (task);
}
int generic_callback_9(exc_msg_t *info_struct){
printf("OMG A CRASH CALLBACK\n");
getchar();
task_terminate(info_struct->task);
exit(-1);
}
int pthread_cancel(pthread_t thread)
{
FAR struct pthread_tcb_s *tcb;
/* First, make sure that the handle references a valid thread */
if (thread == 0)
{
/* pid == 0 is the IDLE task. Callers cannot cancel the
* IDLE task.
*/
return ESRCH;
}
tcb = (FAR struct pthread_tcb_s *)sched_gettcb((pid_t)thread);
if (tcb == NULL)
{
/* The pid does not correspond to any known thread. The thread
* has probably already exited.
*/
return ESRCH;
}
/* Only pthreads should use this interface */
DEBUGASSERT((tcb->cmn.flags & TCB_FLAG_TTYPE_MASK) == TCB_FLAG_TTYPE_PTHREAD);
/* Check to see if this thread has the non-cancelable bit set in its
* flags. Suppress context changes for a bit so that the flags are stable.
* (the flags should not change in interrupt handling).
*/
sched_lock();
if ((tcb->cmn.flags & TCB_FLAG_NONCANCELABLE) != 0)
{
/* Then we cannot cancel the thread now. Here is how this is
* supposed to work:
*
* "When cancelability is disabled, all cancels are held pending
* in the target thread until the thread changes the cancelability.
* When cancelability is deferred, all cancels are held pending in
* the target thread until the thread changes the cancelability, calls
* a function which is a cancellation point or calls pthread_testcancel(),
* thus creating a cancellation point. When cancelability is asynchronous,
* all cancels are acted upon immediately, interrupting the thread with its
* processing."
*/
tcb->cmn.flags |= TCB_FLAG_CANCEL_PENDING;
sched_unlock();
return OK;
}
#ifdef CONFIG_CANCELLATION_POINTS
/* Check if this thread supports deferred cancellation */
if ((tcb->cmn.flags & TCB_FLAG_CANCEL_DEFERRED) != 0)
{
/* Then we cannot cancel the thread asynchronously. Mark the cancellation
* as pending.
*/
tcb->cmn.flags |= TCB_FLAG_CANCEL_PENDING;
/* If the thread is waiting at a cancellation point, then notify of the
* cancellation thereby waking the task up with an ECANCELED error.
*
* REVISIT: is locking the scheduler sufficent in SMP mode?
*/
if (tcb->cmn.cpcount > 0)
{
notify_cancellation(&tcb->cmn);
}
sched_unlock();
return OK;
}
#endif
/* Otherwise, perform the asyncrhonous cancellation */
sched_unlock();
/* Check to see if the ID refers to ourselves.. this would be the
* same as pthread_exit(PTHREAD_CANCELED).
*/
if (tcb == (FAR struct pthread_tcb_s *)this_task())
{
pthread_exit(PTHREAD_CANCELED);
}
#ifdef CONFIG_PTHREAD_CLEANUP
/* Perform any stack pthread clean-up callbacks.
*
* REVISIT: In this case, the clean-up callback will execute on the
* thread of the caller of pthread cancel, not on the thread of
* the thread-to-be-canceled. Is that an issue? Presumably they
* are both within the same group and within the same process address
* space.
*/
pthread_cleanup_popall(tcb);
#endif
/* Complete pending join operations */
(void)pthread_completejoin((pid_t)thread, PTHREAD_CANCELED);
/* Then let task_terminate do the real work */
return task_terminate((pid_t)thread, false);
}